The invention relates to the technical field of communication protocols, and particularly provides a network security communication method which is characterized by comprising the following steps: S1, starting nodes, opening a port as an inter-node KCP protocol communication port, and then opening a node discovery mechanism port; s2, through a node discovery mechanism, nodes in the block chain obtain IP and KCP protocol monitoring ports of peer nodes in the network; s3, establishing a KCP protocol connection based on UDP between the nodes; s4, negotiating between the nodes to establish an encrypted channel; s5, messages are sent among the nodes; s6, the node sends a message to a block chain service layer for processing; and S7, sequentially disconnecting the KCP connection between the nodes. Compared with the prior art, the encryption channel is adopted, the safety of data communication is guaranteed, and the method has good popularization value.